Controlling device.



' H. W. 011mm.

CONTROLLING DEVICE.

APPLIOATION FILED 52m. 1a, 1909.

Patented May 23, 1911.

UNITED STAWENT OFFICE.

HERBERT W. CHENEY, OF MILWAUKEE, WISCONSIN, ASSIGNOR 'I'O .ALLIS-CHALMERS COMPANY, A CORPORATION OF NEW JERSEY.

CONTROLLING DEVICE.

Specification of Letters Patent.

- Patented May 23, 1911.

Application filed September 13, 1909. Serial No. 517,488.

To all whom it may concern:

Be it known that I, HERBERT W. CHENEY,

a citizen of the United States, residing at- Milwaukee, in the county of Milwaukee and State of Visconsin, have invented certain stance, in multiple voltage controllers it is' 'generally desirable to out resistance gradu-- ally into the motor field circuit to raise the motor speed while the.armature connections are unchanged, and to out suchv resistance quickly out as the motor armature is con nected to mains of a higher voltage. In the ordinary form of rheostatic controller, in

order to obtain a cut-ting in or cutting out of the resistance after the rheostat arm has been moved to cut'tlie resistance gradually out or in it is necessary to move the rhcostat arm over the entire set of contacts.

It is the object of my present. invention to avoid thenecessity for such movement. This is accomplished by providing an arrangcn'ient whereby after the variable resistance has been fully cut in or out, a switch is thrown to change the line connection from one end of the resistance to the other, thus cutting the entire resistance out or in as the case may be. The next operation of the rheostatarm tocut resistance in or out is in the'oppositc direction to its previous movement to obtain the same result.

My invention is adapted for many uses, but by ,way of illustration, I have shown it in connection with a multiple voltage controller.

The various novel features of my invention will appear from thc description and drawings, and will be particularly pointed out in the claims.

Figure 1 is a bottom view of a controller embmlying my invention, the bottom plate of the casing being removed and some parts being broken away; and, Fig. 2 is a diagram showing the plan of operation.

The controller drum 10 has a number of sets of contacts 11,12, 13, 14, .15 and 16,

.which cooperate with stationary contact fingers 17 to connect the armature 18 of a motor to be controlled between different sets of the multiple voltage mains 19. On the shaft of the controller, preferably at the lower end thereof, is a cam 20 which cooperates with a roller 21 on a bell-crank lever 21 to move a rheostat arm 22 over a set of contacts a, b, c, cl, 6, and f. The arni 22 is biased in a clockwise direction by a spring23. This arm is preferably mounted on a plate 24 near the bottom of the controller, and its pivotal point is in line with the controller shaft. If desired, the arm may be loosely pivoted on such shaft. In

Fig. 1 the plate 24 is partly broken away to show the drum 10 and cam 20. The end contacts a and f are longer than the intermediate contacts, and when the rheostat arm 22 is moved to the outer end of either the contact a. or the contact f it moves aspring 25' over' a' center line and causes it to snap a double throwswitch 26 from one position to the other. This movement of switch 26 may be accomplished in other ways if desired, as for example by employing a cam action. I g

The parts are shown with the controller in off position. When the controller is moved forward, or in the direction shown by the arrow in Fig. 1,' into the first position the controller drum connects the motor armature 18 between those of the multiple voltage mains 19 which have the lowest voltage, and cam 20 and roller 21 move the arm 22 to the counter-clockwise end of the contact segment at. As the controller is moved farther forward, the armature connections are maintained the same, while by means of the cam 20, roller21, and bell. crank lever 21 the arm 22 is moved successively into engagement with the contacts 5, c, d, e, and f to out the resistance 27 gradually into circuit with the field magnet 28 of the motor. If the controller is moved farther forward after the arm 22 has rcached'the clockwise end of the contact segment f, the motor armature circuit is broken at the controller drum, the arm 22 is moved to the counter-clockwise end of the contact segment f to move the spring 25 over its dead center and snap the switch 26 from the position shown in full t'nc field circuit by changing the connections of the field ma net circuit irom one end of such resistance to the other, and the armature is connected by the controller drum to I the mains of the next higher voltage. is the controller is moved forward from this point the cam 20 allows the spring" 23 to move the arm in clockwise direction into engagement with. the contacts 6, cl, (2, Z), and a successively, thus againcntting the resistance 27 gradually into the field circuit. This time, however, the movement which positc direction to what it was in the pre ceding case. if the forward movement is continued to bring the arm 1 in a clockwise d .ection past the counterclockwise end of the segment a, the armature circuit is again broken, the switc 1 is moved from its dotwe r 11 w. w L LLQ line PQSlLlUll L0 1 s in me iosi i011 LO change the eonnec ion of the hold circuit from end. of the field resistance 2. to the her, and the ari'x'iatnrc is connected to the us which give the third voltage. The fcrw rd movement of 1c controller may he is stance being out in by the arm 22 while 1 nature remains connected to each oi radios and being cut out the switch as the armature ch irgred t'rom one continued until the highest voitage reached, the held 1' "I the multiple voltin type, nor is it 1 "ID to be operated are many 0 er be 0 necessary for the rho by a cam. in eed, uses of the rhcestatic controller scheme shown here. Themultiple voltage control ltl being sno'wn in connection with it merely to illustrate one of its uses.

any other modifications may he made in ifirecisc arrangement oi? the controller 1 l are she (hiscribedfand all such which .hin the spirit and scope of aim. to cover in the follow- :1 rhc'sistat, a :csistancc, a plurality of contacts connected to said resistance, an

arm movable over said contacts, and means for reversing the connection of the resistance to the hne when the arm passes certain points in its movement.

2., in a rheostat, a resistance, a plurality of contacts connected to said resistance, an arm movable over said contacts and' means for changing a connection of the line from one end of the resistance to the other when the arm is movel into either extreme position.

3. In a rheostat, a resistance, of contacts connected to points sistance, an arm movable over said contacts, and a double throw switch arranged to be thrown from one position to the other when said arm is moved to either extreme position, said switch when in its two positions connecting the two ends of the resistance to the circuit respectively.

t. in a'multiple voltage controller, means for connecting a motor armature to different sets of mains of a multiple volt-age system, a rheostat arranged to cut resistance into the motor field circuit while the motor armature connections remain unchanged, and a switch for changing the connection of the field circuit from one end of the resistance of said rheostat to the other when the armature connections are changed.

5. In a rheostat, an arm arranged to be moved in one direction to vary the resistance in circuit, and means for changing the connections so that the same resistance variation may he obtained by mowment of the arm in the other direction.

6. in a rheostat, a. series of resistance contacts, an arm movable over said contacts, and means for changing the connection of said contacts so that the arm may he moved in either direction to effect the same results.

liiilwaul-zce, Wis, Sept. 9, 1909.

In testimony whereof l aflix my signature. in the presence of two witnesses.

HERBERT W. CHENEY.

Wi z

(inns. L. Bra. 2*, Ron. STALL.

a plurality on said re- 

